<template>
	<view>
		<view class="search-box">
		  <uni-search-bar
        @input="input"
        :radius="100"
        cancelButton="none"
      ></uni-search-bar>
		</view>
    
    <!-- 搜索建议列表 -->
    <view
      class="sugg-list"
      v-if="searchResults.length !== 0"
    >
      <view
        class="sugg-item"
        v-for="(item, index) in searchResults"
        :key="index"
        @click="gotoDetail(item.goods_id)"
      >
        <view class="goods-name">
          {{item.goods_name}}
        </view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view
      class="history-box"
      v-else
    >
      <!-- 标题区域 -->
      <view class="history-title">
        <text >搜索历史</text>
        <uni-icons
          type="trash"
          size="17"
          @click="cleanHistory"
        ></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag
          :text="item"
          v-for="(item, index) in historys"
          :key="index"
          @click="gotoGoodsList(item)"
        ></uni-tag>
      </view>
    </view>
    
  </view>
</template>

<script>
	export default {
		data() {
			return {
				// 延时器的 timerId
        timer: null,
        // 搜索关键词
        kw: '',
        // 搜索结果列表
        searchResults: [],
        // 搜索历史
        historyList: []
			}
		},
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      // input 输入事件
      input (e) {
        // console.log(e)
        clearTimeout(this.timer)
        
        this.timer = setTimeout(() => {
          
          this.kw = e
          // console.log(this.kw)
          this.getSearchList()
        }, 500)
      },
      // 根据搜索关键词，搜索商品建议列表
      async getSearchList() {
        // 判断关键词是否为空
        if (this.kw === '') {
          this.searchResults = []
          return
        }
        // 发起请求，获取搜索建议列表
        const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw})
        // console.log(res)
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        // 调用搜索建议，保存搜索关键词
        this.saveSearchHistory()
      },
      // 点击item跳转
      gotoDetail(id) {
        uni.navigateTo({
          // 指向详情页面的url
          url: `/subpkg/goods_detail/goods_detail?goods_id=${id}`
        })
      },
      // 保存关键词
      saveSearchHistory () {
        this.historyList.push(this.kw)
        this.historyList = [...new Set(this.historyList)]
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      // 清空历史记录
      cleanHistory() {
        this.historyList = []
        uni.setStorageSync('kw', '[]')
      },
      // 点击跳转到商品列表
      gotoGoodsList() {
        uni.navigateTo({
          url: `/subpkg/goods_list/goods_list?query=${this.kw}`
        })
      },
    },
    computed: {
      historys() {
        return [...this.historyList].reverse()
      }
    }
	}
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list {
  padding: 0 5px;
  .sugg-item {
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;
    .goods-name {
      // 文字不允许换行
      white-space: nowrap;
      // 溢出隐藏
      overflow: hidden;
      // 文本溢出使用...代替
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
.history-box {
  padding: 0 5px;
  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list {
    display: flex;
    flex-wrap: wrap;
    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
